(Sub) CLAUSE / ANNEX NUMBER:

4.1.4

(Sub) CLAUSE / ANNEX HEADING:

General Test Conditions – Conduct of Tests

OTHER RELEVANT (Sub) CLAUSES / ANNEXES (as applicable):

None

DESCRIPTION OF ISSUE:

How can Clause 4.1.4 be applied in order to maximize efficiency in testing?

APPLICATION GUIDELINE:

Clause 4.1.4 states, “The temperature measurements shall be carried out with the apparatus positioned in accordance with the instructions for use provided by the manufacturer…”

The instructions provided by the manufacturer shall be:

  1. packaged with each sample of the product
  2. legible and understandable
  3. sufficiently detailed so that installation cannot be misinterpreted.

Clause 4.1.4 states, “or, in the absence of instructions, the apparatus shall be positioned….” followed be instructions as to the free space used during temperature testing.

In applying this part of the requirement, the test house shall:

  1. Build an open-fronted, wooden test box as described in Clause 4.1.4 or
  2. Ask the manufacturer of the product to supply a box as described in Clause 4.1.4 or
  3. Conduct the temperature test with ventilation openings blocked as a more severe application of Clause 4.1.4. This method can generally not be used when the construction includes heat sinks or other convection heat methods where heat would be dissipated rather than contained within the test box. Also, the higher temperatures that may be obtained when using this method should not be considered non-compliant and a re-test using methods 1) or 2) above would be necessary.

RATIONALE:

Instructions, if provided, shall be sufficiently detailed such that a user can understand how to properly install the product. An example of this wording is “The product should not be used in a confined space such as a bookcase.”

When using the blocked ventilation opening method, openings may be blocked using heavy tape, boards or other convenient means. Since openings are completely blocked instead of allowing the distances given by Clause 4.1.4, this is considered a more severe application of the temperature test.

However, consideration should be given to convection constructions where the air would be allowed to dissipate heat that the test box would contain.

OTHER:

none

SEE RELATED PAG:

none